Avoid allocating packet buffers unnecessarily.

[meshlink] / src / node.c

diff --git a/src/node.c b/src/node.c
index bbb574f2ad8aacfe5f517ecf28b269f84999e0f2..b8caed6c7e06ca182f671fd046f8be4d44d76611 100644 (file)
--- a/src/node.c
+++ b/src/node.c
@@ -39,41 +39,49 @@ void init_nodes(meshlink_handle_t *mesh) {
 }
 
 void exit_nodes(meshlink_handle_t *mesh) {
-       if(mesh->node_udp_cache)
+       if(mesh->node_udp_cache) {
                hash_free(mesh->node_udp_cache);
-       if(mesh->nodes)
+       }
+
+       if(mesh->nodes) {
                splay_delete_tree(mesh->nodes);
+       }
+
        mesh->node_udp_cache = NULL;
        mesh->nodes = NULL;
 }
 
 node_t *new_node(void) {
-       node_t *n = xzalloc(sizeof *n);
+       node_t *n = xzalloc(sizeof(*n));
 
        n->edge_tree = new_edge_tree();
        n->mtu = MTU;
        n->maxmtu = MTU;
-       n->devclass = _DEV_CLASS_MAX;
+       n->devclass = DEV_CLASS_UNKNOWN;
 
        return n;
 }
 
 void free_node(node_t *n) {
-       if(n->edge_tree)
+       n->status.destroyed = true;
+
+       utcp_exit(n->utcp);
+
+       if(n->edge_tree) {
                free_edge_tree(n->edge_tree);
+       }
 
        sockaddrfree(&n->address);
 
        ecdsa_free(n->ecdsa);
        sptps_stop(&n->sptps);
 
-       if(n->mtutimeout.cb)
+       if(n->mtutimeout.cb) {
                abort();
+       }
 
-       free(n->hostname);
        free(n->name);
-
-       utcp_exit(n->utcp);
+       free(n->canonical_address);
 
        free(n);
 }
@@ -86,8 +94,9 @@ void node_add(meshlink_handle_t *mesh, node_t *n) {
 void node_del(meshlink_handle_t *mesh, node_t *n) {
        timeout_del(&mesh->loop, &n->mtutimeout);
 
-       for splay_each(edge_t, e, n->edge_tree)
+       for splay_each(edge_t, e, n->edge_tree) {
                edge_del(mesh, e);
+       }
 
        splay_delete(mesh->nodes, n);
 }
@@ -116,15 +125,51 @@ void update_node_udp(meshlink_handle_t *mesh, node_t *n, const sockaddr_t *sa) {
        if(sa) {
                n->address = *sa;
                n->sock = 0;
+
                for(int i = 0; i < mesh->listen_sockets; i++) {
                        if(mesh->listen_socket[i].sa.sa.sa_family == sa->sa.sa_family) {
                                n->sock = i;
                                break;
                        }
                }
+
                hash_insert(mesh->node_udp_cache, sa, n);
-               free(n->hostname);
-               n->hostname = sockaddr2hostname(&n->address);
-               logger(mesh, MESHLINK_DEBUG, "UDP address of %s set to %s", n->name, n->hostname);
+
+               node_add_recent_address(mesh, n, sa);
+
+               if(mesh->log_level <= MESHLINK_DEBUG) {
+                       char *hostname = sockaddr2hostname(&n->address);
+                       logger(mesh, MESHLINK_DEBUG, "UDP address of %s set to %s", n->name, hostname);
+                       free(hostname);
+               }
+       }
+}
+
+bool node_add_recent_address(meshlink_handle_t *mesh, node_t *n, const sockaddr_t *sa) {
+       (void)mesh;
+       bool found = false;
+       int i;
+
+       /* Check if we already know this address */
+       for(i = 0; i < MAX_RECENT && n->recent[i].sa.sa_family; i++) {
+               if(!sockaddrcmp(&n->recent[i], sa)) {
+                       found = true;
+                       break;
+               }
+       }
+
+       if(found && i == 0) {
+               /* It's already the most recent address, nothing to do. */
+               return false;
        }
+
+       if(i >= MAX_RECENT) {
+               i = MAX_RECENT - 1;
+       }
+
+       memmove(n->recent + 1, n->recent, i * sizeof(*n->recent));
+       memcpy(n->recent, sa, SALEN(sa->sa));
+
+       n->status.dirty = true;
+       return !found;
 }